NXP LPC4088: Add missing SPI SSEL pin to Pinmap

[scamille]

The Pin P5_3 (p31) was missing from the NXP LPC4088 SPI PinMap for SSEL.

Adding this Pin allows usage of SPISlave with SSP2 using the SSEL pin.

The pin and its SSP2_SSEL function is both documented in https://os.mbed.com/media/uploads/embeddedartists/lpc4088_qsb_pinning.xlsx as well as in UM10562 LPC408x/407x User manual Rev. 3 — 12 March 2014 chapter 7.4.1.4 Table 90 (https://www.nxp.com/docs/en/user-guide/UM10562.pdf).

Notes:

• Pull requests will not be accepted until the submitter has agreed to the contributer agreement.
• This is just a template, so feel free to use/remove the unnecessary things

Description

A few sentences describing the overall goals of the pull request's commits.

Status

READY/IN DEVELOPMENT/HOLD

Migrations

If this PR changes any APIs or behaviors, give a short description of what API users should do when this PR is merged.

YES | NO

Related PRs

List related PRs against other branches:

branch	PR
other_pr_production	link
other_pr_master	link

Todos

• Tests
• Documentation

Deploy notes

Notes regarding the deployment of this PR. These should note any required changes in the build environment, tools, compilers and so on.

Steps to test or reproduce

Outline the steps to test or reproduce the PR here.

[mbed-ci]

Automatic CI verification build not done, please verify manually.

[0xc0170]

Hello,

even though this is simple change, can you sign https://os.mbed.com/contributor_agreement/ ? (I could not locate your nick on mbed) ?

[scamille]

Sure. Since I did not yet have a individual account, I just created a new one at https://os.mbed.com/users/scamille/ .

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 937
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5918/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 625
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/5918/

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 948
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/5918/

Triggering tests

/morph test
/morph uvisor-test
/morph export-build

[cmonr]

Failure with unrelated device. Retesting.
/morph uvisor-test

[mbed-ci]

Test : SUCCESS

Build number : 779
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/5918/779

[mbed-ci]

Exporter Build : SUCCESS

Build number : 636
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/5918/

[0xc0170]

/morph uvisor-test